LHR - SJU

£345 Find Cheap Flights from London Heathrow Airport to San Juan

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to San Juan departing on 29/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult

KAYAK searches hundreds of travel sites at once for deals on flights to San Juan Luis Munoz Marin Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to San Juan.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to San Juan.
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Cheap Flight Deals from Heathrow to San Juan (LHR-SJU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Heathrow to San Juan that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent return flight deals from Heathrow to San Juan

KAYAK's recommended return flight deals from the most popular airlines that fly from Heathrow to San Juan.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Icelandair Logo
08:15 - 21:18LHR-SJU
18h 03m1 stop
Icelandair Logo
13:15 - 09:30SJU-LHR
15h 15m1 stop
£501Icelandair
Find Deal
Tue, 9 Sep - Wed, 24 Sep
Icelandair Logo
08:15 - 01:45LHR-SJU
22h 30m1 stop
Icelandair Logo
12:55 - 06:30SJU-LHR
12h 35m1 stop
£509Icelandair
Find Deal
Wed, 3 Sep - Thu, 18 Sep
JetBlue Logo
08:15 - 21:18LHR-SJU
18h 03m1 stop
JetBlue Logo
11:30 - 09:30SJU-LHR
17h 00m1 stop
£512JetBlue
Find Deal
Wed, 3 Sep - Thu, 18 Sep
Icelandair Logo
08:25 - 23:25LHR-SJU
20h 00m1 stop
Icelandair Logo
17:25 - 06:30SJU-LHR
32h 05m1 stop
£529Icelandair
Find Deal
Mon, 2 Jun - Wed, 11 Jun
Iberia Logo
06:30 - 18:30LHR-SJU
17h 00m2 stops
Iberia Logo
13:55 - 10:35SJU-LHR
15h 40m1 stop
£546Iberia
Find Deal
Wed, 3 Sep - Thu, 18 Sep
JetBlue Logo
08:15 - 20:05LHR-SJU
16h 50m1 stop
JetBlue Logo
03:23 - 20:45SJU-LHR
12h 22m1 stop
£579JetBlue
Find Deal
Mon, 16 Jun - Mon, 23 Jun
Iberia Logo
11:30 - 11:15LHR-SJU
28h 45m2 stops
Iberia Logo
16:55 - 17:15SJU-LHR
19h 20m1 stop
£580Iberia
Find Deal
Sat, 20 Sep - Tue, 30 Sep
 Logo
19:40 - 09:58LHR-SJU
19h 18m1 stop
 Logo
21:30 - 19:45SJU-LHR
17h 15m1 stop
Sat, 7 Jun - Sat, 14 Jun
 Logo
07:25 - 10:45LHR-SJU
32h 20m2 stops
 Logo
01:27 - 14:40SJU-LHR
32h 13m3 stops
Sat, 7 Jun - Fri, 13 Jun
British Airways Logo
10:05 - 22:55LHR-SJU
17h 50m1 stop
British Airways Logo
14:05 - 09:25SJU-LHR
14h 20m1 stop
£893British Airways
Find Deal
Thu, 3 Jul - Tue, 12 Aug

KAYAK's insights & trends for Heathrow to San Juan flights

Get data-powered insights and trends into flights from Heathrow to San Juan to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from London Heathrow Airport to San Juan?

The average price of all round-trip flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from London Heathrow Airport to San Juan, look for departures on Mondays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from San Juan, Tuesday is the cheapest day to fly and Saturday is the most expensive.

What is the cheapest month to fly from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport is September, where tickets cost £494 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is £853 and £777 respectively.

How far in advance should I book a flight from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know - Cheap tickets from London Heathrow Airport to San Juan

Low season

June

High season

November

Cheapest flight

£345
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly and prices are also 12% lower on average.
Flight from London Heathrow Airport to San Juan

When to book flights from Heathrow to San Juan

Are your dates flexible? Find out the best times to travel from Heathrow to San Juan based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking London Heathrow Airport to San Juan flights

  • What is the cheapest flight from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport?

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to San Juan Luis Munoz Marin Intl Airport was £458 for a one-way ticket and £666 for a return.

  • Which aircraft models fly most regularly from London Heathrow Airport to San Juan?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from London Heathrow Airport to San Juan?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between London Heathrow Airport and San Juan, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from London to San Juan, JetBlue or Iberia?

    The two airlines most popular with KAYAK users for flights from London to San Juan are JetBlue and Iberia. With an average price for the route of £666 and an overall rating of 7.3, JetBlue is the most popular choice. Iberia is also a great choice for the route, with an average price of £690 and an overall rating of 7.0.

  • How does KAYAK find such low prices on flights from London Heathrow Airport to San Juan?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London Heathrow Airport to San Juan.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London Heathrow Airport to San Juan?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Juan from London Heathrow Airport is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London Heathrow Airport to San Juan?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to San Juan with an airline and back to London Heathrow Airport with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London Heathrow Airport to San Juan?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Juan from London Heathrow Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 5 airlines serving from Heathrow to San Juan

 
See real verified KAYAK customer reviews for airlines flying from London to San Juan. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Heathrow to San Juan? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.6
FinnairOverall score based on 1272 reviews
6.7Food
8.1Crew
7.4Comfort
7.6Boarding
6.9Entertainment
Airline reviews

Boarding uncomfortable. Stewardess said I would have to check my carry on as there was no room in the overhead bins. Another passenger helped me find a spot.

8.0 ExcellentAnonymous, Jan 2025DFW - CVG
Read more Finnair reviews

Boarding uncomfortable. Stewardess said I would have to check my carry on as there was no room in the overhead bins. Another passenger helped me find a spot.

Any flight that lands safely is a good flight. However our leg from Helsinki was delayed 1 hour with no explanation. The delay would not allow us to make our connection to Cincinnati. I was informed by American Airlines that our Cincinnati flight was rescheduled for the following day. I immediately made a non refundable hotel reservation in Dallas. Upon exiting the plane at Dallas I was given a hotel voucher. Nice, but I can't get a refund on the hotel I booked. A little communication would have been helpful. Food on Finnair is below quality of Korean Air.

The cabin crew really looked like they wanted to be somewhere else. They weren't really interested in providing an attentive service to full fare paying passengers at all. However the Captiain's in flight announcements were relaxed and very entertaining.

Crew were professional and responsive. Food was mediocre and breakfast could do with revampinmg

Food was very ordinary for premium economy, very small portions.

i dont know WHY they call it business class. the seats are NOT significantly wider than economy seats, they just do not let the middle seats be beepked to give the illusion of more space between passengers. the seats do NOT recline any more than economy seats either. the only real difference is the full meal served to business (vs none for economy). I would rather have a wider, lie flat ACTUAL business class seat with no food for a 3 hr flight. this was pretty disappointing to say the least.

There wore nice leather like sits, in my opinion seats lay out bit tight . Crew was great they did averything possible to make averywone comfortable as possible, food was, think worst I ever head on flight, head chicken and yellow rice. Ice cream was a nic treat.

Our previous flight was delayed but they waited for us to board.

Flight was delayed, short time connection to next flight but we make it, service was good, worth to fly just to try thair on board blueberry juce. Eccelent communication with airline.

My American Airlines flight was deleted and you guys never let me know

The regular feedback of any changes to our flights. The Jetblue staff were very helpful. Our flights were great. Lots of leg room!

Except for the 28 minute delay leaving and the earlier reschedule to a later takeoff time the flight was good.

Very well organized both boarding and deplaning. Very satisfied with the service I received.

Love the mosaic program, being able to move to an extra space seat for free is awesome

Flight was on time arrived at the destination 10min early they kept in touch via email

I paid for the service of having the right to choose my seat and it was not like that, they put me where they wanted and I explained to one of the staff that they were before boarding and they were very rude. I am traveling with the family and they put us in separate seats.

The flights are back on time and everything else runs perfectly.

I volunteered to let them put my carry on suitcase in the baggage storage area. But when we landed I was told it was being unloaded IN A DIFFERENT TERMINAL! I had to walk (painful for me) a long way to retrieve my bag and my ride had to move from the waiting area they were in to a totally different one. Not happy.

They announced at the last minute that international travelers had to checkin at counter. This created a long line and unnecessary stress.

Confusing. Delay updates were out of whack At one point it said my flight was 25 hours. Three gate changes and two delays only to change back to original departure time. Gate announcer and on board flight attendant (Alejandro) making the announcements was impossible to understand due to accent and speed of speech. After beverage service the rear flight attendants sat back there on their phones. No refills no checking in, one sweep through for trash collection. Very impersonal. Bring back Coke products

For an economy lite experience, it's by far the best I've had. New planes, clean, great destinations. Very happy to have discovered Iceland Air.

Smooth efficient airline. Think they should have their own bag drop as the queue took 30mins to bmscan and drop

Good. Lacking overhead bin space. No food offered but you can order online or in flight and pay for snacks.

No food was served for 7.5 hrs flight. When our flight changed to other airlines due to wether issue, our seats booked with no checked in luggage when I already payed for. We end up to pay 90 euro per suitcase.

The flights were in time and the bags arrived. well done

Only serving 2 small coffee in 7.5 hrs flight with very limited choice to order food.

Booked with Kayak… Economy Class it said. I had filtered for 1 checked bag. Get to boarding and it says I have Economy Light w/ no checked bags. $136 each way for baggage now. Do not use smartfares.com. Very misleading and a terrible start to this trip.

Overall good. I was surprised how easy it was to get from plain to plain in such a short time. Food choices were not so great and quite expensive. Entertainment was ok. Flights were smooth.

Bad. Flights were late, by hours. No clear information was provided even until the delayed boarding time.

Again, lines for boarding are a problem in iceland. The flight itself was fine and very smooth. No complaints. We would definitely fly icelandair again.

I wish they could put the pre-tsa check on the tickets or global entry.

Couldn’t keep my luggage and had no choice. Ground staff didn’t even bother to explain why.

The cabin crew were great very helpful and accommodating. We had a fellow passenger throw up next to us. The flight crew did an amazing job cleaning up and reseating us. We did question as to if he should have been let on the flight as his condition was likely self imposed.

A 13 hour flight with no food apart from what they offered from a menu you had to pay for. On top of that, there were no blankets, so during the flight when the cabin temperature dropped, everyone was very cold. Neither of these things were highlighted at the time of booking. This is the worst long-haul flight I’ve ever encountered.

The airline refused to board me because I showed up only 50 minutes prior to departure time, despite the fact that shortly before that, when I arrived at the airport still in time, they changed the terminal and I had to take a bus that took 20 minutes. Personal at the airport was unable to let me in, customer care was beyond useless, the original airline operator (Iberia) was as useless as a toilet paper roll core in time of a wipe and all this uselessness made me waste my ticket, my reservations, my long time parking, food and most of all the joy of being with my family for the new year after working my bottom off even at Christmas. Am I happy? Come and ask me in person!

Excellent with no delays and according to the time schedule.

Overall a great. However, the seating is way too narrow, for guys with any shoulder width. Luckily the crew moved the guy next to me, or it would have been miserable.

okay, will recommend from PR to Madrid, faster turn around

HORRIBLE. 3 hours delayed. Crew did not communicate properly and was rude to passengers enquiring. Delay caused multiple passengers to miss connections.

The plane was not well maintained. The entertainment system didn’t work properly, eg moving map. Many of the seat controls did not work. Cabin temperature fluctuated considerably during the flight. The seat allocated was poor, it was noisy and offered no privacy. The perfume in the toilet triggered severe allergies. Crew was very goid.

Flight Attendant Karen Lynn was an absolute delight. She assisted in every portion of the services provided throughout the flight, aided with any and all concerns expressed by passengers, and even helped comfort an upset child who was one of five of a traveling family. This quality of service is what keeps me coming back to American. Thank you!

The worst, flight cancelled because the aircraft was not full. Heathrow ground crew totally not helpful and arrogant. Lady proposed us flight with 40min layover instead of direct and said it is our problem of course she was unable to do anything as everything was beyond her control she claimed. after calling on hotline another flight was booked. Flight was cancelled last second so we could not take direct from Zurich but we had to stay overnight in London.

Very quick boarding. I was surprised we only got a small water and small thing of cookies, everything else was for purchase. No entertainment. Crew was excellent though.

Flight delayed in terms of boarding and Kayak was great in updating but the team on the groping at British Airways were really poor

A basic tea/ coffee and a snack could be provided especially for long distance flyers.

The information in the airport, and the app was different. Be aware. Different terminals in Stuttgart, so we had to walk a lot. It's a small airport so it wasn't a big deal, but it was ludicrous to see the error in the app.

Food was terrible , crew were excellent , IFE was dire . Overall comfortable seat and cabin. Nothing special .

If my tv wasn’t broken and I wasn’t in a seat that didn’t allow for sleeping

Very long and took extra push back to BA staff to get a realistic flight after they made me miss my original direct flight. Eventually landed 9 hours late and incurred many extra costs with other missed bookings

They overbooked the flight by 3 people. It is completely unacceptable to tell 3 people, with paid tickets, that need to get home for children etc, that they need to stay another night. No compensation. No apology.

Everything you need to know for your flight from Heathrow to San Juan

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